the corrugated pipe seals are used in UPVC double wall corrugated pipe and HDPE double wall corrugated pipe line. available size is from ¢110mm to ¢1000mm . We have the ability of improving and designing special rubber seals to fullfill different customers, request. Welcome you send us samples and drawings. material can be NBR ,nature rubber, EPDM,food grand silicone rubber, viton , Neoprene,etc .